A good example of heroism, and the pure will to see his Platoon progress is Arem from the first Gaster Kingdom Platoon, or at least what was left from them. Arem, one of the few that managed to survive here and fairly a team player.
Since the beginning, Woldemir noticed something special in this man. Something that not everyone could have, well more like he has several characteristics that would make a Grand Master proud.
With the recent increase in Guard count, firmer procedures have to be taken. See Woldemir over looked the fact that each individual Guard could have some trait that is slowing them down from becoming a battle beast, and it was his responsibility to figure out that trait and get rid of it so a Guard can be molded to perfection, but he didn't.